Headphone



FIG. 1 is a perspective view of a headphone showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is right side view thereof (the left side view is a mirror image of the right side view).

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines shown on the drawings are included for the purpose of illustration and form no part of the claimed design. 

The ornamental design for headphone, as shown and described. 